13kW Solar & 42kWh Battery Installation
As power costs keep climbing across Victoria, more households are choosing solar + battery systems to gain real control over their energy future. This solar and battery installation showcases a high-capacity system designed for a family seeking independence, stability, and long-term savings in Donnybrook, VIC 3064.
The results are impressive: a system producing over 2.6× the energy an average home needs, delivering 90–95% energy independence, and paying for itself in just 1–4 years. A smart, future-proof upgrade that truly transforms how a home is powered.
Client Background & Energy Goals
The homeowner, a tech-forward family in Donnybrook, VIC 3064 with increasing energy demands, wanted to achieve the following:
- Reduce grid reliance as much as possible
- Support future electrification (EV, heat pumps, induction cooking)
- Secure long-term protection from rising electricity costs
- Adopt a battery large enough to run the home for multiple days
- Ensure compliance, traceability, and premium installation standards
To meet these goals, a 13 kW solar system paired with a 42kWh battery was proposed—a design significantly larger than the average Australian home system (8–10 kW solar + 10–13 kWh battery).
System Design & Technical Overview
Solar Array (13kW)
- 30 × 440 W monocrystalline panels
- Manufactured by Zhejiang Sunpro Power
- Certified under IEC 61215-2021
- Expected lifespan: 25–30 years
- Degradation rate: 0.5–0.7% annually
- Year 25 performance: 10.5–11.2 kW (80–85% output)
FoxESS Battery Storage (42kWh)
- 9 modules (~4.66 kWh each) – EQ4800 series FoxESS
- Lithium (likely LFP chemistry)
- 6,000–8,000 cycle life
- Expected lifespan: 15–20 years
- Can cover 2+ days of normal usage
- Indoor installation for added longevity
Inverter (FoxESS KH8 – 8kW)
- DC/AC oversizing ratio of 1.65:1 for optimized performance
- 97.5% efficiency
- Fully AS4777.2:2020-compliant
- VPP-ready for future grid participation
This configuration ensures strong generation across mornings and evenings while maximizing usable solar energy throughout the year.
Get a Quotation From Green Electric Solution
If you’re considering solar in Victoria and want to know what size system you actually need—how many panels, what battery capacity, how much you can save, or which rebates you qualify for—Green Electric is here to make it simple. We’ll walk you through everything in clear, easy-to-understand steps and give you a personalised assessment based on your home and energy use.
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Energy Performance Outcomes
Daily & Annual Generation
- Average daily production: ~52.8kWh
- Annual generation: ~19,272kWh
- Peak output: 13.2kW
Energy Independence
An average Australian household uses 19–20kWh/day.
This system produces 263% of typical household needs, meaning:
- The battery alone can cover 2+ days of consumption
- Self-sufficiency reaches 90–95% with proper management
- Grid usage becomes minimal—mainly during extended cloudy periods
For EV owners and high-energy families, this system ensures a year-round, reliable energy supply.
Financial & Energy Summary
- Estimated Annual Production: 16,008 kWh
- Estimated Annual Savings: $2,214.45
Government Rebates & Incentives
- 09 Solar PV STCs (7 × $38.00): −$4,142.00
- 389 Battery STCs (7.8 × $38.00): −$14,782.00
- Solar VIC PV Rebate: −$1,400.00
- Solar VIC PV Interest-Free Loan: −$1,400.00
- Total Government Rebates: $21,724.00
Please note that federal battery STCs will be dropped in 2026. Simply provide your information and secure your year-end savings/rebate.
Payback Period
- 1–4 years, dramatically faster than the industry’s typical 4–7 years.
In short, the system pays for itself quickly and continues delivering long-term financial benefits.
Environmental Impact
The system’s contribution to sustainability delivers truly meaningful outcomes:
- Annual CO₂ reduction: ~15.4 tonnes
- 25-year reduction: ~385 tonnes
- Equivalent to planting 8,800 trees
- Offsetting emissions is equivalent to removing 3.5 cars from the road
- Saves ~38,544 liters of water annually
This installation significantly reduces grid demand and coal-based electricity generation.
Real-World Usage Scenarios
Scenario A: High-energy household (30kWh/day)
- Solar covers 66% of direct use
- Battery covers rest
- Annual savings: $6,000–$7,500
Scenario B: Average user (20kWh/day)
- 96% solar coverage
- Grid reliance drops below 10%
- Annual savings: $4,500–$5,500
Scenario C: EV Owner (15kWh home + 10kWh EV)
- Solar covers the home and the majority of the charging
- Grid usage minimal
- Annual savings: $5,000–$6,500
The system is highly adaptable for current needs and future electrification.
Overall Results & Strategic Value
This installation is more than just a solar system—it’s a long-term energy strategy. The client now enjoys:
- Energy independence: 90–95%
- Grid blackout protection for 2–3 days
- Peak tariff avoidance
- VPP-ready revenue opportunities ($200–500/year)
- Home value increase of $10,000–20,000
- A future-proofed home ready for EV charging and electrification
Conclusion—13kW Solar & 42kWh Battery Installation
This 13 kW solar system with 42 kWh of battery storage is a game-changer for homeowners who want real energy independence, big savings, and a greener footprint. Its high-capacity design, thorough documentation, and long-lasting performance mean reliable, low-cost, and sustainable energy for years to come. If you’ve ever dreamed of taking control of your power bills and future-proofing your home, this case study shows exactly what’s possible with the right solar + battery setup.